首先说明一下，微信小程序是不能发布游戏的。
关键代码一:手指按下，滑动，弹起，确定蛇头转的方向，代码如下
//获取手指按下坐标touchStart:function(e){startX = e.touches[0].x;startY = e.touches[0].y;},//获取手指移动坐标touchMove:function(e){moveX = e.touches[0].x;moveY = e.touches[0].y;distX = moveX – startX;distY = moveY – startY;if(Math.abs(distX) > Math.abs(distY) && distX > 0){console.log(“right”);direction = “right”;}else if(Math.abs(distX) > Math.abs(distY) && distX < 0){console.log(“left”);direction = “left”;}else if(Math.abs(distX) < Math.abs(distY) && distY > 0){console.log(“bottom”);direction = “bottom”;}else if(Math.abs(distX) < Math.abs(distY) && distY < 0){console.log(“top”);direction = “top”;}},touchEnd:function(){snakeDirection = direction;},
关键代码二：碰撞检测
//碰撞函数function collide(obj1,obj2){var l1 = obj1.x;var r1 = l1 + obj1.w;var t1 = obj1.y;var b1 = t1+obj1.h;var l2 = obj2.x;var r2 = l2 + obj2.w;var t2 = obj2.y;var b2 = t2 + obj2.h;if(r1>l2 && l1<r2 && b1>t2 && t1<b2){return true;}else {return false;}}
关键代码三：绘制矩形
function draw(obj){context.setFillStyle(obj.color);context.beginPath();context.rect(obj.x,obj.y,obj.w,obj.h);context.closePath();context.fill();}
附带一个简单随机数方法
//随机函数function rand(min,max){return parseInt(Math.random()*(max-min)+min);}
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